import * as types from './mutation-types'
import {playMode} from '../common/js/config'
import {shuffle} from '../common/js/util'
import {saveSearch,deleteSearch,clearSearch,savePlay,saveFavorite,deleteFavorite} from 'common/js/cache'


function findIndex(list,song) {
    return list.findIndex((item) => {
        return item.id === song.id
    })
}

export const selectPlay = function ({commit, state}, {list, index}) {
    commit(types.SET_SEQUENCE_LIST, list)
    if (state.mode === playMode.random) {
      let randomList = shuffle(list)
      commit(types.SET_PLAYLIST, randomList)
      index = findIndex(randomList, list[index])
    } else {
      commit(types.SET_PLAYLIST, list)
    }
    commit(types.SET_CURRENT_INDEX, index)
    commit(types.SET_FULL_SCREEN, true)
    commit(types.SET_PLAY_STATE, true)
}
  
  export const randomPlay = function ({commit}, {list}) {
    commit(types.SET_PLAY_MODE, playMode.random)
    commit(types.SET_SEQUENCE_LIST, list)
    let randomList = shuffle(list)
    commit(types.SET_PLAYLIST, randomList)
    commit(types.SET_CURRENT_INDEX, 0)
    commit(types.SET_FULL_SCREEN, true)
    commit(types.SET_PLAY_STATE, true)
}

export const insertSong = function ({commit,state},song) {
    let playlist = state.playlist.slice()
    let sequenceList = state.sequenceList.slice()
    let currentIndex = state.currentIndex
    // 记录当前歌曲
    let currentSong = playlist[currentIndex]
    //  查找当前列表中是否有待插入的歌曲并返回其索引
    let fpIndex = findIndex(playlist,song)
    // 因为是插入歌曲，所以索引＋1
    currentIndex ++
    // 插入这首歌到当前索引位置
    playlist.splice(currentIndex,0,song)
    // 如果已经包含了这首歌
    if(fpIndex > -1) {
      // 如果当前插入的序号大于列表中的序号
      if(currentIndex > fpIndex){
        playlist.splice(fpIndex,1)
        currentIndex --
      }else {
        playlist.splice(fpIndex+1,1)
      }
    }

    let currentSIndex = findIndex(sequenceList,currentSong) + 1

    let fsIndex = findIndex(sequenceList,song)

    sequenceList.splice(currentSIndex,0,song)

    if(fsIndex > -1) {
      if(currentSIndex > fsIndex) {
        sequenceList.splice(fsIndex, 1)
      }else {
        sequenceList.splice(fsIndex + 1, 1)
      }
    }

    commit(types.SET_PLAYLIST,playlist)
    commit(types.SET_SEQUENCE_LIST,sequenceList)
    commit(types.SET_CURRENT_INDEX,currentIndex)
    commit(types.SET_FULL_SCREEN, true)
    commit(types.SET_PLAY_STATE, true)
}

export const saveSearchHistory = function ({commit},query) {
  commit(types.SET_SEARCH_HISTORY,saveSearch(query))
}

export const deleteSearchHistory = function  ({commit},query) {
  commit(types.SET_SEARCH_HISTORY,deleteSearch(query))
}

export const clearSearchHistory = function ({commit}) {
  commit(types.SET_SEARCH_HISTORY,clearSearch())
}

export const deleteSong = function ({commit,state},song) {
  let playlist = state.playlist.slice()
  let sequenceList = state.sequenceList.slice()
  let currentIndex = state.currentIndex
  let pIndex = findIndex(playlist,song)
  playlist.splice(pIndex,1)
  let sIndex = findIndex(sequenceList,song)
  sequenceList.splice(sIndex,1)

  if(currentIndex > pIndex || currentIndex === playlist.length) {
    currentIndex -- 
  }
  commit(types.SET_PLAYLIST,playlist)
  commit(types.SET_SEQUENCE_LIST,sequenceList)
  commit(types.SET_CURRENT_INDEX,currentIndex)
  
  const playingState = playlist.length > 0
  commit(types.SET_PLAY_STATE,playingState)
}

export const deleteSongList = function ({commit}) {
  commit(types.SET_PLAYLIST,[])
  commit(types.SET_SEQUENCE_LIST,[])
  commit(types.SET_CURRENT_INDEX,-1)
  commit(types.SET_PLAY_STATE,false)
}

export const savePlayHistory = function ({commit},song) {
  commit(types.SET_PLAY_HISTORY,savePlay(song))
}

export const saveFavoriteList = function  ({commit},song) {
  commit(types.SET_FAVORITE_LIST,saveFavorite(song))
}

export const deleteFavoriteList = function ({commit},song) {
  commit(types.SET_FAVORITE_LIST,deleteFavorite(song))
}